Impulse starter for ignition apparatus



Patented May `1l, 1 926.

" [Il aljrlin STATES vPATam".

LouIsiBEvEn', or RL'AINFIELD, new JERSEY, ASSIGNOR To .ROBERT Basen AKTIEN GESELLSCHAFT, or STUTTGART, GERMANY.

I iuruns-r. STARTER FOR IGNITION APPARATUS.

Application aieauugust s, 1924. seriai No. 'r3o,2s7. i

This-invention. relates to impulse starters for ignition apparatus of the type employing two couplingparts, one afixedto a driving sha-ft and constituting the' driving 6 cou ling part and the otherf aiiixed tothe vsha t of the rotor of the ignition device and constituting the'driven coupling part. The invention more particularly relates avdevice in which the temporary locking of 10 the rotor of the ignition apparatus is effected by pawls attached-to' the driven coupling part and engaging in their working position the rear face of-a stationary abut- .ment providedon the casing of the ignition device. Throwing the rotor forward is effected by a spring connecting the driving part ofthe coupling to the driven part when the pawls are lifted oii' ,the abutment 'by projections arranged on the "coupling-part 2Q lwhich is aiiixed to the driving shaft. The pawls are devised to Vforin fly-bodies, so

thatl they, at a certain definite rate of revo lution `of the driving shaft,'move outwardly beyond`the range of the lstationary abuty ment on the casing of the ignition device under' the action of the centrifugal fonce.

Then the movement of the rotorI by -jerks or impulses and its uniform rotation commence's.

AA primary object of the invention is .to do away withjthe drawback: experienced with the known impulse starters ofthe kind in question of one' or another offtla p-awls falling back from its position of disengage- 85 ment into its working position due to shocks whilei the ignition devi-ce is in full operaY Y tion, 'whereby either the impulse starter is `-exposed to the risk of being destroyed or the possibility arises of stalling the motor by reason` of the sudden retarded ignition which is a consequence' of the sudden locking of the rotor, Another object of the invention is the provision of' means to put the impulse starter out of action completely, for instance for adjusting or re-adjusting the ignition denise i 'Accordingly, the invention provides means j hich-are adapted to Irevent the levers or -1 5 Spawls from-attaini'ng ocking position except atqtlref'desred predetermined times. In

pr -el'able fd-rm of my invention IA pro- -pa'thyfor the pawls restraining vement to lacking position and the possibility ofthe swung-out pawls fallto suc-h 1 which is so' devised that-.onlil smallgap 65 remains between its end .an theopposite face of the stationary abutment by which thep'awls areretained. or locked', whereby ing backinto 'their Working. position isonly 60 a very' small one. p y.

Another improvement consists in the, provision of means by which the width of said' gap ma bevaried by adjusting said slidep-ath. hereby `the range of the number oi' rate of revolutions within which the impulse. starter lremains acting can be varied at liberty. The narrower the said gap, the earlier, that is to lsay at a correspondingly lower' number of revolutions, will the move- 70 ment by jerks of/ the rotor of the ignitiondevice cease because the pawls sliding on tle slide-path require a -certaintime to, get i1 to their checking or locked position through the ga If the gap is closed completely orneary completely, the impulsestarter is p-ut out of action.

lWith the foregoing objects and principles in view, lthe invention resides in the novel subject matter yhereinafter described and claimed, the description being supplemented by the accompanying drawings, in which- Figure 1 is an end elevational view of the` im roved impulse starter, looking toward t e ignition apparatus, and with the driving coupling member shown in dotted lines and only in partial view to avoid obstructing an .end elevational view of the driven coupling member;

Figure 2 is a similar view showing the starte in another position;

Figi re 3 is a view corresponding to Fig. 2 and showing the slide-path combined with adjusting means; Figure- 4 is a partial sectional view of the starteron line A-B of Fig. 2, with the driving couplin 'member and the spring shown disassemb ed and inside elevational view, the figure also showing a art of the ignition apparatus in side elevation and the end portion of its casing in sectlon. The impulse sta-rter consists of two. couplingarts or members 1 and 2, of which 1 is afi ixed to the driving shaft 3, and 2 to( the driven shaft 4 which is the shaft of the 105 rotor of the ignition apparatus 5. The two parts of thecoupling. are connected with each other by aspring 6, the and (5 of which pling part 2 connected herewith.' An annular member 14 forms a slide-path for the pawls and is preferably combined with a casing 15 for the driving device. The slidepath 14 and the abutment 13 are located .in the same circle. The object of, the member 14 is Lto retain the pawls 10 so as to prevent.y them from moving into the checking ,01'i locking position. Y

Preferably the member 14 may be adjustable. For .this purpose an arm 21 may be attached to the sleeve 15 as'clearly shown in Fig: 3. This arm is connected with an operating handle by a rodfoi` the like (not shown) in av well known manner. The arm 21 is attached to the. sleeve-like casing` 15 by a strip or band 22 one end 23 of which is firmly 'connected with the arm 21 and the other end of which is secured to a member 24 so arranged as to slide in a recess of the vlever 21 and to beV shifted in4 said lrecess by a screw 26 whereby the strip or band 22 is firmly pressed around the casing 15.

The casing 15 is secured to thecasing 12 of'the ignition apparatus by screws 18 In order to render the casing rotatably adjustable slits 17 are providedhthrough which the screw extend; 'j

Cam projections 20 are provided on the inner face of the driving part of member 1,' to release the pawls 16 from locking position, as will more lfully 4appear from the description of the operation of the device,

later to be given. In the assembled position of the parts 'now shown disassembled m Fig. 4, the driving coupling part or path 14, as clearly shown in Fig.- When the projection 11 of the lever or pawl 10 gets to the gap 19 between the edge of saidJ slide-path 14 and the abu ment 13 the' lever or pawl 10 falls into its hecking position (Fig. 2) sin which the projection 11 is locked by the abutment 13. While the shaft 3 'and the coupling part 1 continue to rotate, the coupling part 2 remai-ns stationary. '.lne spring 6 has now been put under tension. After a certain rotation, one of the cams 20 of the coupling-part 1 comes into position immediately beneath the free curved ter.- minal of ethe retained pawl 10 `and lifts it (Fig. 3)I from its checking position. Now the `coupling part 2 'can follow the pull of the spring 6 and is abruptl impelled lby it in the direction of rotation of the coupling half 1 until the projections 2`Qfeon tact wit-h the arms 9. The velocity imparted to the armature 5 by this movement of the cou ling half'2 is high enough to cause an e cacious spark. A

As soon as the engine hascommenced to start, and all rotating parts have attained\ a certain speed the pawls 10 remain, under the action ofthe centrifu al force, in their swung-out position in W ich they are no` longer retained by the abutment 13. Onl when the ,speed slows down do they fal back into the positions shown in the iigures. ,Figs 1, 2 and 3 show clearly that when apawLis moved by a shock, wnile the engine is operating at normal speed, from its swungout position towards the7 hub 16, it can get into the checking position only when its projection 11 `is sltuated immediately over the gap 19. In an other member 1 is nested within the casing 15, )been loosened; and they \may be tightened with the inner face of the member 1 closely adjacent the annular rim of the driven lmember indicated by the numeral 2 inFig.

, to positions between the arms 9 of the driven member. In Figs. 1, 2 and 3, only the outer rim of thedriving member 1 ana the cam projections 20 are indicated and by broken lines, 1n order to avoid obstructingv the end elevational view of the driven ber 2 and associated parts.

The operationofmy improvedrstarter is as follows:.. lVhen tlieshaftj 3: is. rotated *slowly for instancewh'en 'startingtheengina the ,pawl 10 which approachesv the abutment 13 tends toffalliontoihub 16 of..the cou'pling half- 2, but'it is' prevented ,therefrom vhythe. slide- 'again after the desired adjustment is finished. When it is desired to adjust the tive in permitting the entry Vof the pro- ,jection l11 of the pawl 10 into checking or locking position, it will be observed, is cornpletelyclosed, when the left hand `end vof the rim element 14, as the parts are viewed in Figs. 1, 2 land 3, is advanced, by rotatable adjustment of the casing 1 5, into contact v with the stationary abutment 13 extending fromthe -casing12 of the ignition apv thereto.

Although I have shown-in -tliedrawings and described in the -specification al certain distinct form of` the invention, I wish it to be understood that I do not limit myself It is `obvious that changes in detail may be made'` Without departing from the spirit and scope of the invention.

' Vhat is claimed is':A

1. impulse starterv for magnetos, comprising, in combination, a 4driven member mounted on the rotor shaft of the magneto,

a driving member and a spring connecting said members, a stop ositioned adjacent said driven member, a etent pivotally and ecentrically mounted on said driven meni- 85 ignition ap 55. said drivingpart and adapted in one driva slide-path restraining said ber and adapted for tion for engagement said driven member is tating,

movement into posi- With said stop when and centrifugally maintained in in- 20 operative position when said driven member is rotated at Irelatively high speed, and adjustable restrainin means adapted by ady restrain said detent .justment to positive from movement toposition for engagement 25 with said stop throughout the Whole or any desired arc of each ycle of rotary movement of said driven member.

2. An impulse driving device for ignition apparatus, comprising' in combination, a rotaryv driven coupling part, .a driving ycoupling part, a spring connecting the said drivenpart and the said driving part, levers pivotally and eccentrically mounted on the y.said driven part, a fixed -abutment on the aratus adapted to engage said levers in loc ing position to hold said driven part immovable, projections extending from said driving` part and adapted in one drivmg movement of said-driving lpart to disengage said levers from'the locking position, i

a. slide-path restraining said levers from ovement into position for engagement with said abutment, said slide-path having a cut out receiving the said stationary abutment.

3. An impulse driving device for ignition apparatus, comprising in combination, a rotatable driven coupling part, a driving coupling part,l a spring connecting thesaid driven artand the said driving part, levers pivotal y and eccentrically mounted on the vsaid driven part, a fixed labutment on the ignition\apparatus adapted-to engage said levers in locking position to hold said driven part immovable, projections extending from ing movement of said driving art to disengage said levers from the locliing position, levers from movement into position for engagement with saidlabutment, said slide-path having a cut out receiving the said stationary abutment, the said cutout being l-ar er than the said abutment to allow the saidevers to fall into 05 thelocking position after havin traversed he continuous part of Said sl-idlpath.

. said driven part, a fixed a ing a cut outy receiving at rest or slowly ro-l driven driven 4. Animp'ulse driving-"device forignitionn apparatus, comprising in combination, a rotatable driven` coupling part, a driving coupling part, a, spring cpnnecting thesaid driven part and the saidv driving part', leversv pivotally and eccentricall mounted 'onjtlie hutment on the i nition 'apparatus adapted to engage said levers in locking positionl to hold saiddriven part immovable, projections extending-from said driving part and adapted in one dariving movement-of said driving part to disengage said levers from the locking position, lan

adjustable slide-path restraining said levers from movement into position' for engage-- ment with said abutment, said'slidefway hav,- the said stationary abutment, the said cut than the said abutment.

5. An impulse driving device for ignition apparatus, comprising in combination, a rotatable driven coupling part, a driving coupling part, a spring connecting the said part and the said driving part, levers pivot-all?7 and eccentrically mounted on the lsaid driven part, a fixed abutment -on the ignition ap ara-tus adapted to engage'said levers in loc ing position to yhold said driven part immovable, prc'ections extendincg from said driving part an adapted in one riving movement of said driving part to disengage said, levers from the locking position, an adjustable arc-shaped slide-'path restrainin out being larger said levers frommovement-into position fo engagement with'said abutment, means for rotatably adjusting the said slide-path `from the outside of the driving device, said slidey and eccentrically mounted on the' -ioo igt

engage said levers from the lookin position, i

a casmgsurrounding the said coup ing parts, and means positively restraining said levers from movment into position' for engagement with said abutment during a major portion of'each cycle of rotary movement of said driven art, said means being integral with the saiti -casin A n impuse driving device for ignition apparatus, comprising 'in combination, a rotatable driven coupling part, a driving couiling part, a spring connecting the said rivelipart and the said driving part, 1e'ver s 'pivotally"andL3 eceentrically .mounted on the s aid drivingy part and adapted in one dr1v ing movement of said drivingpart to disengage said levers. rom the locking position, a notatayble easing? surrounding the said coupling parts, an adjustable slide-path restrainingsaid levers from movement into easing, means arranged onwthe said casin position Ifor 'engagement with said abutment, said slide-path being lintegral with the said for adjusting the said vcasing and the sai slide-path, said slide-path Ahaving a'cut out receiving the said stationary abutment; theU said out out being larger than the saidabutment. 4 J In' testimony whereof I hereunto -ax my 20 signature. a

LOUIS BEEH. 

